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Convertible Subordinated Notes (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Convertible Subordinated Notes, Carrying Values of Liability and Equity Components
as $0.1 million.
The carrying values of the liability and equity components of the Convertible Notes at December 31, 2017 and 2018 are reflected on our Consolidated Balance Sheet as follows (in thousan
Schedule of Maturities of Long-term Debt
The aggregate maturities of our long-term debt for the next five years subsequent to December 31, 2018 and thereafter are as follows (in thousands):
Years ending December 31,
 
2019
$
2,015

2020
1,298

2021
1,046

2022
553

2023
27,689

2024 and thereafter
3,439

Total
$
36,040

The aggregate maturities of our Convertible Notes for the five years subsequent to December 31, 2018 are as follows (in thousands):
 
 
Principal Maturity
 
Discount Amortization
 
Present
 Value
Years ending December 31,
 
 
 
 
 
 
2019
 
$
—

 
$
(242
)
 
$
(242
)
2020
 
—

 
(270
)
 
(270
)
2021
 
6,346

 
(48
)
 
6,298

2022
 
—

 
—

 
—

2023
 
—

 
—

 
—

Total
 
$
6,346

 
$
(560
)
 
$
5,786

The aggregate maturities of our Senior Notes for the five years subsequent to December 31, 2018 are as follows (in thousands):
 
 
Principal Maturity
 
Discount Amortization
 
Present
 Value
Years ending December 31,
 
 
 
 
 
 
2019
 
$
—

 
$
(493
)
 
$
(493
)
2020
 
—

 
(528
)
 
(528
)
2021
 
—

 
(565
)
 
(565
)
2022
 
—

 
(605
)
 
(605
)
2023
 
—

 
(648
)
 
(648
)
Thereafter
 
325,000

 
(1,763
)
 
323,237

Total
 
$
325,000

 
$
(4,602
)
 
$
320,398